foreign policy. >> reporter: the younger brother told the fbi that he and his brother were inspired by the anti-u.s. internet preaching, of the radical cleric anwar al-awlaki. though the american born al qaeda figure was killed a year and a half ago. his words still have power. here, condemning actions in iraq and afghanistan, which the younger brother said became their motivation to attack. >> we have chosen the path of war in order to defend ourselves from your oppression. >> reporter: the elder brother, tamerlan had another favorite speaker, a chechen rebel leader, whose video tamerlan posted online. here, the leader threatens death to anyone who helps the infidels. he was killed by the russians last year. and it was on the internet, dzhokhar told fbi agents that they learned how to make a bomb with a pressure cooker. all found at an al qaeda online magazine called "inspire." >> this suggests people appear to be getting smarter about building easily manufactured bombs and then targeting sites in the united states. >> it is your statement. >> reporter: in russia the mother of the bro